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The Big Bang Theory on CBS

2007, TV Show

The Big Bang Theory Full Episodes (135)

Latest Episode: The Big Bang Theory - The Bon Voyage Reaction

May 16, 2013 Season 6 Episode 24 watch on CBS (Free)

A new success for Leonard makes Sheldon very jealous and throws Penny for a loop. Meanwhile, Koothrappali pushes Lucy too far in their relationship. (TV-PG L)

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The Roomate Transmorgrification

May 19, 2011 Season 4 Episode 24

When Bernadette receives her Ph.D., the guys take joy in reminding an emasculated Wolowitz that he is the only one in their group who isn't a doctor. Meanwhile, Koothrappali becomes Sheldon's new roommate after hearing Leonard and Priya engaging in a Star Trek bedroom fantasy, on the fourth season finale.

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The Engagement Reaction

May 12, 2011 Season 4 Episode 23

When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

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The Wildebeest Implementation

May 05, 2011 Season 4 Episode 22

Raj attempts to cure his social anxiety disorder of talking to women, while Penny uses Bernadette to spy on Leonard and his girlfriend.

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The Agreement Dissection

Apr 28, 2011 Season 4 Episode 21

Priya uses her lawyer skills to pick apart the roommate agreement...and put Sheldon in his place. Meanwhile, the girls take Sheldon dancing.

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The Herb Garden Germination

Apr 07, 2011 Season 4 Episode 20

Sheldon and Amy experiment on their friends by spreading gossip, while Howard takes a big step in his relationship with Bernadette.

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The Zarnecki Incursion

Mar 31, 2011 Season 4 Episode 19

When someone hacks Sheldon's online gaming account, the guys go on a quest to find the culprit.

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The Prestidigitation Approximation

Mar 10, 2011 Season 4 Episode 18

Leonard must choose between his new girlfriend, Priya, and his friendship with Penny. Meanwhile, Howard drives Sheldon crazy with a magic trick.

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The Toast Derivation

Feb 24, 2011 Season 4 Episode 17

When the gang starts hanging out at Raj's and Sheldon realizes it's actually Leonard who is the center of their social group, Sheldon decides to get a new group of friends.

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The Cohabitation Formulation

Feb 17, 2011 Season 4 Episode 16

As Wolowitz contemplates taking things with Bernadette to the next level, he must choose between his girlfriend and his mother. Meanwhile, Leonard rekindles his relationship with Raj's sister, Priya.

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The Benefactor Factor

Feb 10, 2011 Season 4 Episode 15

A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science. JESSICA WALTER (Arrested Development) guest stars as the widowed benefactress and JOSHUA MALINA (The West Wing) guest stars as the University President.

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The Thespian Catalyst

Feb 03, 2011 Season 4 Episode 14

Sheldon wants Penny to give him acting lessons, hoping that they will help him become a better teacher. Meanwhile, Koothrappali fantasizes about his best friend's girlfriend.

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The Love Car Displacement

Jan 20, 2011 Season 4 Episode 13

Tension runs high when everyone is staying at the same hotel for a science event and Bernadette runs into her ex-boyfriend (guest star RICK FOX, three-time NBA champion with the Los Angeles Lakers).

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The Bus Pants Utilization

Jan 06, 2011 Season 4 Episode 12

Leonard's idea for a smartphone app derails his friendship with Sheldon as they fight for control of the project.

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The Justice League Recombination

Dec 16, 2010 Season 4 Episode 11

The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

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The Alien Parasite Hypothesis

Dec 09, 2010 Season 4 Episode 10

Amy finds she has sexual feelings for Penny's ex, Zack (guest star BRIAN THOMAS SMITH) while Koothrappali and Wolowitz try to prove who would be the better superhero.

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The Boyfriend Complexity

Nov 18, 2010 Season 4 Episode 9

Penny asks Leonard to lie to her father, Wyatt (guest star KEITH CARRADINE), while Howard, Raj and Bernadette pull an all-nighter at a telescope.

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The 21 Second Excitation

Nov 11, 2010 Season 4 Episode 8

When the guys camp in line for a screening, their plans are thwarted by Sheldon's greatest nemesis, WIL WHEATON (guest starring as himself). Meanwhile, Penny and Bernadette invite Amy to her first slumber party.

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The Apology Insufficiency

Nov 04, 2010 Season 4 Episode 7

When an FBI agent (guest star ELIZA DUSHKU) interviews the guys for Wolowitz's security clearance, Sheldon's answers during the screening, put Wolowitz's clearance in jeopardy.

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The Irish Pub Formulation

Oct 28, 2010 Season 4 Episode 6

A visit from Raj's sister (guest star AARTI MANKAD) creates tension among the guys - especially when Leonard keeps an affair secret from Sheldon, Howard and Raj.

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The Desperation Emanation

Oct 21, 2010 Season 4 Episode 5

Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.

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The Hot Troll Deviation

Oct 14, 2010 Season 4 Episode 4

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work. Battlestar Galactica's KATEE SACKHOFF and Star Trek's GEORGE TAKEI guest star as themselves as Wolowitz's love gurus. MELISSA RAUCH reprises her role as Howard's girlfriend, Bernadette.

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The Zazzy Substitution

Oct 07, 2010 Season 4 Episode 3

The guys are concerned as Sheldon searches for an alternative to human companionship after he and Amy (MAYIM BIALIK) break up. LAURIE METCALF reprises her role as Sheldon's mother.

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The Cruciferous Vegetable Amplification

Sep 30, 2010 Season 4 Episode 2

When Sheldon realizes he won't live long enough to download his consciousness into a robot body, he attempts to extend his lifespan. Apple Co-Founder STEVE WOZNIAK guest stars as Himself.

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The Robotic Manipulation

Sep 23, 2010 Season 4 Episode 1

On the fourth season premiere, Penny (series star KALEY CUOCO) finds herself along for the ride on Sheldon's (series star JIM PARSONS) first date ever. Meanwhile, Wolowitz (series star SIMON HELBERG) finds a new use for a robotic arm. MAYIM BIALIK guest stars as Sheldon's date, Amy Fowler.

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The Big Bang Theory Clips & Interviews collapse view

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The Big Bang Theory: The Complete Sixth Season [HD]

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The Big Bang Theory: The Complete Sixth Season

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The Big Bang Theory: “Sheldon Sleeps At Penny's”

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The Big Bang Theory: “Not Penny's Arm”

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The Big Bang Theory: “Sheldon's Group Of Cats”

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The Big Bang Theory: “Sheldon's Spot”

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The Big Bang Theory: “Foamy Vengence”

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The Big Bang Theory: “Earthquake Hard Hats”

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The Big Bang Theory: “Drinking Coffee While Driving”

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The Big Bang Theory: “Speak In A Low Voice”

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The Big Bang Theory: “Costume Party Dude”

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The Big Bang Theory: “Schrodinger's Cat”

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The Big Bang Theory: “Leonards Crush”

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The Big Bang Theory: “History Christmas Tree”

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The Big Bang Theory: “Superman's Laundry”

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